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US 7,067,050 B2Granted
Petroleum hydrocarbon binder with reduced polycyclic aromatic hydrocarbon content
AssigneeMarathon Ashland Petroleum LLC
InventorsMelvin D. Kiser, David C. Boyer
Life of this patent
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Abstract
A binder pitch material includes a petroleum pitch and asphalt fraction obtained from petroleum crude oil and has a significantly lower polycyclic aromatic hydrocarbon composition than a coal tar pitch having a like softening point. The pitch material is useful as a binder material for various applications such as clay pigeons.
Claims8
A thermoplastic frangible pitch material containing low concentrations of polycyclic aromatic hydrocarbons comprising:
- (i) a petroleum pitch having a softening point of at least about 100° C. and
- (ii) an asphalt fraction having a softening point ranging from about 70° to about 160° C., wherein the asphalt fraction is produced by distillation or solvent extraction of asphalt containing petroleum crude oil, and optionally, up to about 50% of a solvent or cut back oil, and wherein the asphalt fraction has a specific gravity ranging from about 0.90 to about 1.10;
- whereby the resultant frangible pitch material has a softening point in the range of about 100° C to about 130° C., a total identified polycyclic aromatic hydrocarbon content in the range of about 5000 mg/kg or less, and is an amorphous solid at room temperature.
Dependencies are inferred from the claim text.